Mechanics | Relativity Answers

Calculate the force of gravity between a newborn baby of mass 4 kg and the obstetrician of mass 75 kg, who is 0.2 m from the baby.
Which exerts more gravitational force on the baby, Mars or the obstetrician, given that Mars has a mass of 6.4 1023 kg and is 8. 1010 m from Earth?

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Two objects of equal mass, m, are separated by a distance d. Answer the following questions:
e) If the mass of both objects was doubled and the distance was doubled, what would happen to the force of attraction?
f) If the mass of both objects was halved and the distance was halved, what would happen to the force of attraction?
g) If the mass of one object was quadrupled, where would a person need to stand such that they felt no net gravitational forces? (in other words, such that the gravitational forces balanced out)

When the displacement of a mass on a spring is one half of the amplitude of its oscillation, what fraction of the total energy is potential energy?

Elastic collission in two dimenshan,write expression

By what factor would your weight change if Earth's diameter were tripled and its mass were quintupled?

Calculate the force of gravity on a 22 kg mass if it were 6.4 106 m above Earth's surface (that is, if it were 2 Earth radii from Earth's center.) The mass of Earth is 6. 1024 kg.

starting from rest, how long does it take moving man to reach a velocity of 5 m/s if his acceleration is 1.75 m/s^2?

a person in a kayak starts paddling, and it accelerates from 0 to .60 m/s in a distance of .41 m. If the combined mass if the person and the kayak is 73 kg, what is the magnitude of the net force acting on the kayak?

Assuming that a force of 100 N is pulling an object across a surface (with friction) at a speed of 20 m/s to the right, while a friction force of 100 N magnitude is causing a drag force to the left, what is the speed of the object 10 seconds later?

a lift whose cage is 3m high is moving up with an acceleration of 2m/s.a piece of stone is dropped from the top of the cage of the lift when its velocity is 8m/s.if g=10m/s square ,then the stone will reach the floor of the lift after